2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 static char rcsid[] = "$Id: sys-bsd.c,v 1.16 1995/04/24 05:37:51 paulus Exp $";
32 #include <sys/ioctl.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
36 #include <sys/errno.h>
39 #include <net/ppp_defs.h>
40 #include <net/if_ppp.h>
41 #include <net/route.h>
42 #include <net/if_dl.h>
43 #include <netinet/in.h>
46 #include <netinet/if_ether.h>
51 static int initdisc = -1; /* Initial TTY discipline */
54 static int restore_term; /* 1 => we've munged the terminal */
55 static struct termios inittermios; /* Initial TTY termios */
57 int sockfd; /* socket for doing interface ioctls */
60 * sys_init - System-dependent initialization.
65 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
66 setlogmask(LOG_UPTO(LOG_INFO));
68 setlogmask(LOG_UPTO(LOG_DEBUG));
70 /* Get an internet socket for doing socket ioctl's on. */
71 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
72 syslog(LOG_ERR, "Couldn't create IP socket: %m");
78 * note_debug_level - note a change in the debug level.
84 syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
85 setlogmask(LOG_UPTO(LOG_DEBUG));
87 setlogmask(LOG_UPTO(LOG_WARNING));
92 * ppp_available - check whether the system has any ppp interfaces
93 * (in fact we check whether we can do an ioctl on ppp0).
101 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
102 return 1; /* can't tell - maybe we're not root */
104 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
105 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
112 * establish_ppp - Turn the serial port into a ppp interface.
117 int pppdisc = PPPDISC;
120 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
121 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
124 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
125 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
130 * Find out which interface we were given.
132 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
133 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
138 * Enable debug in the driver if requested.
141 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
142 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
144 x |= (kdebugflag & 0xFF) * SC_DEBUG;
145 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
146 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
153 * disestablish_ppp - Restore the serial port to normal operation.
154 * This shouldn't call die() because it's called from die().
164 * Check whether the link seems not to be 8-bit clean.
166 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
168 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
170 s = "bit 7 set to 1";
173 s = "bit 7 set to 0";
183 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
184 syslog(LOG_WARNING, "All received characters had %s", s);
187 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
188 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
194 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
195 * at the requested speed, etc. If `local' is true, set CLOCAL
196 * regardless of whether the modem option was specified.
198 * For *BSD, we assume that speed_t values numerically equal bits/second.
200 set_up_tty(fd, local)
205 if (tcgetattr(fd, &tios) < 0) {
206 syslog(LOG_ERR, "tcgetattr: %m");
213 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
215 tios.c_cflag |= CRTSCTS;
216 else if (crtscts < 0)
217 tios.c_cflag &= ~CRTSCTS;
219 tios.c_cflag |= CS8 | CREAD | HUPCL;
221 tios.c_cflag |= CLOCAL;
222 tios.c_iflag = IGNBRK | IGNPAR;
226 tios.c_cc[VTIME] = 0;
229 tios.c_iflag |= IXOFF;
230 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
231 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
235 cfsetospeed(&tios, inspeed);
236 cfsetispeed(&tios, inspeed);
238 inspeed = cfgetospeed(&tios);
240 * We can't proceed if the serial port speed is 0,
241 * since that implies that the serial port is disabled.
244 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
251 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
252 syslog(LOG_ERR, "tcsetattr: %m");
260 * restore_tty - restore the terminal to the saved settings.
266 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
268 syslog(LOG_WARNING, "tcsetattr: %m");
274 * setdtr - control the DTR line on the serial port.
275 * This is called from die(), so it shouldn't call die().
280 int modembits = TIOCM_DTR;
282 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
287 * output - Output PPP packet.
296 MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
298 log_packet(p, len, "sent ");
300 if (write(fd, p, len) < 0) {
301 syslog(LOG_ERR, "write: %m");
308 * wait_input - wait until there is data available on fd,
309 * for the length of time specified by *timo (indefinite
313 struct timeval *timo;
320 n = select(fd+1, &ready, NULL, &ready, timo);
321 if (n < 0 && errno != EINTR) {
322 syslog(LOG_ERR, "select: %m");
329 * read_packet - get a PPP packet from the serial device.
337 if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
338 if (errno == EWOULDBLOCK || errno == EINTR) {
339 MAINDEBUG((LOG_DEBUG, "read(fd): %m"));
342 syslog(LOG_ERR, "read(fd): %m");
350 * ppp_send_config - configure the transmit characteristics of
354 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
362 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
364 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
365 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
369 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
370 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
374 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
375 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
378 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
379 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
380 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
381 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
388 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
391 ppp_set_xaccm(unit, accm)
395 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
396 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
401 * ppp_recv_config - configure the receive-side characteristics of
405 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
412 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
413 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
416 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
417 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
420 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
421 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
424 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
425 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
426 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
432 * ccp_test - ask kernel whether a given compression method
433 * is acceptable for use.
435 ccp_test(unit, opt_ptr, opt_len, for_transmit)
436 int unit, opt_len, for_transmit;
439 struct ppp_option_data data;
442 data.length = opt_len;
443 data.transmit = for_transmit;
444 return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
448 * ccp_flags_set - inform kernel about the current state of CCP.
451 ccp_flags_set(unit, isopen, isup)
452 int unit, isopen, isup;
456 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
457 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
460 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
461 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
462 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
463 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
467 * ccp_fatal_error - returns 1 if decompression was disabled as a
468 * result of an error detected after decompression of a packet,
469 * 0 otherwise. This is necessary because of patent nonsense.
472 ccp_fatal_error(unit)
477 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
478 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
481 return x & SC_DC_FERROR;
485 * sifvjcomp - config tcp header compression
488 sifvjcomp(u, vjcomp, cidcomp, maxcid)
489 int u, vjcomp, cidcomp, maxcid;
493 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
494 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
497 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
498 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
499 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
500 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
503 if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
504 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
511 * sifup - Config the interface up and enable IP packets to pass.
514 #define SC_ENABLE_IP 0x100 /* compat for old versions of kernel code */
525 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
526 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
527 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
530 ifr.ifr_flags |= IFF_UP;
531 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
532 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
535 npi.protocol = PPP_IP;
536 npi.mode = NPMODE_PASS;
537 if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) {
538 if (errno != ENOTTY) {
539 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
542 /* for backwards compatibility */
543 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
544 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
548 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
549 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
557 * sifdown - Config the interface down and disable IP.
569 npi.protocol = PPP_IP;
570 npi.mode = NPMODE_ERROR;
571 if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
572 if (errno != ENOTTY) {
573 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
576 /* backwards compatibility */
577 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
578 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
582 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
583 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
590 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
591 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
592 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
595 ifr.ifr_flags &= ~IFF_UP;
596 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
597 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
605 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
608 #define SET_SA_FAMILY(addr, family) \
609 BZERO((char *) &(addr), sizeof(addr)); \
610 addr.sa_family = (family); \
611 addr.sa_len = sizeof(addr);
614 * sifaddr - Config the interface IP addresses and netmask.
621 struct ifaliasreq ifra;
623 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
624 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
625 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
626 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
627 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
629 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
630 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
632 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
633 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
634 if (errno != EEXIST) {
635 syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
638 syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
644 * cifaddr - Clear the interface IP addresses, and delete routes
645 * through the interface if possible.
652 struct ifaliasreq ifra;
654 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
655 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
656 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
657 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
658 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
659 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
660 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
661 syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
668 * sifdefaultroute - assign a default route through the address given.
671 sifdefaultroute(u, g)
675 return dodefaultroute(g, 's');
679 * cifdefaultroute - delete a default route through the address given.
682 cifdefaultroute(u, g)
686 return dodefaultroute(g, 'c');
690 * dodefaultroute - talk to a routing socket to add/delete a default route.
693 dodefaultroute(g, cmd)
699 struct rt_msghdr hdr;
700 struct sockaddr_in dst;
701 struct sockaddr_in gway;
702 struct sockaddr_in mask;
705 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
706 syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
710 memset(&rtmsg, 0, sizeof(rtmsg));
711 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
712 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
713 rtmsg.hdr.rtm_version = RTM_VERSION;
714 rtmsg.hdr.rtm_seq = ++rtm_seq;
715 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
716 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
717 rtmsg.dst.sin_family = AF_INET;
718 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
719 rtmsg.gway.sin_family = AF_INET;
720 rtmsg.gway.sin_addr.s_addr = g;
721 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
722 rtmsg.mask.sin_family = AF_INET;
724 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
725 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
726 syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
738 * sifproxyarp - Make a proxy ARP entry for the peer.
741 struct rt_msghdr hdr;
742 struct sockaddr_inarp dst;
743 struct sockaddr_dl hwa;
747 static int arpmsg_valid;
750 sifproxyarp(unit, hisaddr)
758 * Get the hardware address of an interface on the same subnet
759 * as our local address.
761 memset(&arpmsg, 0, sizeof(arpmsg));
762 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
763 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
767 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
768 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
772 arpmsg.hdr.rtm_type = RTM_ADD;
773 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
774 arpmsg.hdr.rtm_version = RTM_VERSION;
775 arpmsg.hdr.rtm_seq = ++rtm_seq;
776 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
777 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
778 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
779 arpmsg.dst.sin_family = AF_INET;
780 arpmsg.dst.sin_addr.s_addr = hisaddr;
781 arpmsg.dst.sin_other = SIN_PROXY;
783 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
784 + arpmsg.hwa.sdl_len;
785 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
786 syslog(LOG_ERR, "add proxy arp entry: %m");
797 * cifproxyarp - Delete the proxy ARP entry for the peer.
800 cifproxyarp(unit, hisaddr)
810 arpmsg.hdr.rtm_type = RTM_DELETE;
811 arpmsg.hdr.rtm_seq = ++rtm_seq;
813 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
814 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
818 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
819 syslog(LOG_ERR, "delete proxy arp entry: %m");
828 #else /* RTM_VERSION */
831 * sifproxyarp - Make a proxy ARP entry for the peer.
834 sifproxyarp(unit, hisaddr)
838 struct arpreq arpreq;
840 struct sockaddr_dl sdl;
844 BZERO(&arpreq, sizeof(arpreq));
847 * Get the hardware address of an interface on the same subnet
848 * as our local address.
850 if (!get_ether_addr(hisaddr, &dls.sdl)) {
851 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
855 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
856 arpreq.arp_ha.sa_family = AF_UNSPEC;
857 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
858 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
859 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
860 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
861 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
862 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
870 * cifproxyarp - Delete the proxy ARP entry for the peer.
873 cifproxyarp(unit, hisaddr)
877 struct arpreq arpreq;
879 BZERO(&arpreq, sizeof(arpreq));
880 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
881 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
882 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
883 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
888 #endif /* RTM_VERSION */
892 * get_ether_addr - get the hardware address of an interface on the
893 * the same subnet as ipaddr.
898 get_ether_addr(ipaddr, hwaddr)
900 struct sockaddr_dl *hwaddr;
902 struct ifreq *ifr, *ifend, *ifp;
904 struct sockaddr_dl *dla;
907 struct ifreq ifs[MAX_IFS];
909 ifc.ifc_len = sizeof(ifs);
911 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
912 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
917 * Scan through looking for an interface with an Internet
918 * address on the same subnet as `ipaddr'.
920 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
921 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
922 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
923 if (ifr->ifr_addr.sa_family == AF_INET) {
924 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
925 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
927 * Check that the interface is up, and not point-to-point
930 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
932 if ((ifreq.ifr_flags &
933 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
934 != (IFF_UP|IFF_BROADCAST))
937 * Get its netmask and check that it's on the right subnet.
939 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
941 mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
942 if ((ipaddr & mask) != (ina & mask))
951 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
954 * Now scan through again looking for a link-level address
955 * for this interface.
958 for (ifr = ifc.ifc_req; ifr < ifend; ) {
959 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
960 && ifr->ifr_addr.sa_family == AF_LINK) {
962 * Found the link-level address - copy it out
964 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
965 BCOPY(dla, hwaddr, dla->sdl_len);
968 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);